The Tamsui River (formerly romanized as Danshui River, ) is a river in northern Taiwan. It begins at the confluence of Xindian Creek and Dahan Creek at the western boundary of Taipei and New Taipei City, just north of Banqiao District, and flows northward and northwestward, passing the eponymous Tamsui District, then emptying into the Taiwan Strait. Formerly known as the "Dolatok River", it is one of the few rivers in the island that flows along a north-south direction.